Crank-press.



N. SPERBER.

CRANK PRESS.

APPLICATION FILED MABQZB, 1907.

Patented Dec. 1,1908.

4 SHEETS-SHEET 1- N. $PERBER. CRANK PRESS.

APPLICATION FILED MAR. 28.11907.

4 SHEETS-SHEET 2.

Patented Dec. 1,1908.

N. SPERBER.

CRANK PRESS.

APPLICATION FILED MAR. 28, 1907.

Patented Dec. 1,1908.

4 SHEETSSHEET 3.

. Za-i N. SPERBE-R.

CRANK PRESS.

' APPLIUATION FILED MAR. 28, 1907. 905,601 Patented Dec. 1, 1908. 4 SHEETS-SHEET 4.

Figfdi is provided with a safety poseof insuring on the maximum pressure pe valveto .30

1 intermediate memberand thereby a saving .instance in stamping a tem il aybe' ad u ed too 1Qw,i r the w r I a man; operating the.

two at once, enthardness, In all these cases the i of the press or the bendl isi nev1table. 0n the other hand,',for certain:

portafraction or the maximum pressure of the press." If one ofthe above mentioned f cases (occurs, then the di ff sents a considerablecost,

- stamped or NORBERT SPERBER, or PARIS, FRANCE.

ORANKFPBEBB;

Specification of Letters l e-tent.

Patented 1m. 1, 190a.

Application filed March as, 1307. Serial No. 865,178.

To all whom it may concern:

.Be it known that I, NORBERT Srnmmn, a subject of the King of Wiirtemberg, Germany, residing at Paris, France,- have'invented certain new and useful Improvements in'Crank-Presses; and I do hereby declare the followin to be a full, clear, and exact description. ot the invention, such as will enable others skilled in the art to which it a pertains to make and use the same.

.T he object ofthe present invention is a press for cutting, stampin and pressing which is characterized by .t e feature-that anintermediate member is inserted in the direction of the pressure, in the stamping bar, which intermediate \member is exchangeable and has a hydraulic action, and

valve; for the purone hand that the maximum pressure to be exerted by the press will not be exceeded, andto prevent a breakage of the stamp or of the crank shaft of the press, and further to give a determined maximum pressure to all the material .to be pressed by means of the safety valve, which pressure is indicated by means of a pressure gage. Further to cause the rmitted by the safety operate during a certain course of thecrank equally upon the work.

For presses of smallpower, the crank pressure is directly transmittedto the stamp by means of the intermediate member, whereas in heavier constructions the crank pressure is increased toa multiple corresponding to the difierential mechanism arranged in the in power is obtained. With presses of ordinaryconstructionthe piston rod is rigidly connected with the platen bearmg the stamp. In this construction it may happen that for medals orthe like the mi my bu i e incorrectl or .put in of 'di'lferreakin 5 ng of the crank sha blank tofbe' impressed or the material may e imprints, fdies are used .which can only sup-f e, which oftenr reis inevitably spgled All these draw-backsare avoided by the inand 2 i1 elevation and partial section in t positions. In each of these the member embodies differential 3 and 4 show the safety valve elevation; and Fig. fication.

from the crank shaft 3 s uprights 1,12, and dri drive pulley or gearing 4- is attached by the pi terpositio n of the exchangeable intermediate member, and

moreover, power is economized. e accompanying drawing, Figures 1 lustrate an improved press in front wo working intermediate pistons; Figs. 1n section and 5 shows a further modi- 0d 4 is suspended upported on the. two ven by means of a To this crank rod n 4 at its lower end, he piston rod'5 of the drive piston 5 which ciprocates in the drive cyhnder 6., This In th .I The drive or crank r cylinder is connectedwith the two pressure inders 7, 8, by means of the pipes 9, 10.

e pressure pistons 11, 12 working in the two cylinders 7 8 are suspended by the links- 13, 1.4, which links press against the head of the uprights and support the pressure of th movably mounted for vert ment between theupright e two pressure pistons. A platen 15 is reical sliding movesupports Land 2, G

and contains the pressure cylinder, and-on it th the pistons, depressed ing on theone hand a nuts 17, and on the o loose collar or washer above the piston rod 5 a 16, and wlnchalways returns thepistons 11 ere rests a cross-bar 16 serving to guide which cross bar is yielding-1y by means of the spring 18 beargainst the adjusting ther hand against a 16 about the rod 4:- nd the cross bar and 12 into their original position, by means of which the the pressing into the pressu a cylinder 6 is .c osed by means .which is formed as a stufiing' as a connection for; theplatemwhen, the PIS- 1 .The operati [the descen piston. 5, the p 7 ,carriedb :it, which pieeeisin.turnjurther Pr s pushed down, until th ered in thei xt d dpos ti n a the same moment the st forced during re cylinders 7 again returns to the cylinder 6, so it is read for a fresh pressing. The

of a gland 19 box and serves pressure water,

nd 8 hat on 5 rises. n. of the devicelis as follows! t. of the crank rod, and the laten 15 and the cross-bar 16 yfmeans of-the.springj.;18, are

e links 13, 14, have .en-

. 1 amp 2 P s d p hework 2,2.placed uponthe lrne lflxrfl, (as hown in Fig. '2), and the pressmgbegins 1n uch' a manner that the piston 5 which has ,110

' platen 15 bearing the stamp is obliged to continue its motion downwards until the maximum pressure fixed by the safety valve has been reached, that is, until the crank has commencing to rise.

come to its lowermost position and is again On the rising of the crank rod 4 and piston 5, the pressure water is again drawn out of the cylinders 7 and 8 into the cylinder 6, the piston 5 abutting against the gland 19 and the platen 15 and the cross piece with it are raised by the engagement of the collar 16 between the upper end of the piston rod 5" and the lower face of the frame 23. The pins 24, 25, placed in the upper frame 23 of the platen 15 project on rising against the projections 26, 27, of the levers 13, 14, and press them back when they rise further, until the uppermost crank position is attained, whereupon the operation is repeated. The wedges 28, 29, serve for the ad ustment for height of the cross piece 16, whilethe pressure is regulated bymeans of the nut 17 The platen 15 with its contained cylinder and cooperating pistons constitutes an intermediate member etween the power crank rod 4 and the stamp 20, and being held in place in the supports 1 and 2 by means of plates 15 I thereby being made removable and exchangeable for another platen having a system of cylinders of different size, which feature of construction enables the press to be adapted to the different circumstances of use as previously set out. The platen 15 may be removed as follows: The matrix 21 is removed from the base of the press, as is customary in a change of work, and the gland 19 is unscrewed and the end plates 15 of the platen unbolted and removed, whereupon the pistons 11 and 12 areunco'upled'from the links 13 and 14, say, at the lower pivotal joint.

The platen is then free to drop, together with the pistons 11 and 12 and the cross-bar 16 until the bar 16 clears the pin 4, which thendriven out, releasing the piston 5 so 1t can drop back into its cylinder 6, the

platen can now be slipped endwise from between the uprights 1 and 2 and other members substituted. The same cross-bar 16 can be reinstated with the substitute platen,

and the rods of thenew pistons 11 and 12 coupled to the links, with the rod of the new piston pinned to the crank rod 4. Thereupon, another matrix 21 corr onding to the new stamp 20 is put in p ace in the known manner, and the press is again ready -ing the die.

In conjunction with the construction shown in Figs. 1 and 2, may be used the form of safety valve illustrated in connection with Figs. 3 and 4, said safety valve device being on the side opposite the observer in said Figs. 1 and 2, and in operative relation to the cylinder 6. Figs. 3 and 4 show the intermediate member without the differential pistons but with the safety valve and pressure gage in detail. Figs. 3 and 4 show a press in which the crank rods 4 act directly u on the pressure piston 39 which slides 1n tie cylinder 40 whereby the latter is placed directly in the platen 15 support- To this cylinder 40 is attached the safety valve and pressure gage, wherein in the case of excessive pressure, the pressure water liberated flows through the safety valve 30 in the c linder 31 and is agam forced into the cylinder 40 on the using of the crank shaft by means of the piston 35.

To the bar 16'there is attached the fork 32 in which is located a two-arm lever 33.. On the ascent of the platen 15 and piston 39 the lever 33 is turned by means of the piston rod upon its fulcrum, and the end of the lever 33 provided with a set-screw 34 acts upon the piston 35 and thereby presses back the pressure water contained in the cylinder 31.through the valve 36 into the cylinder 40, so that the piston 39 always remains at the predetermined initial pressure. The nuts 37 serve for the adjustment of the pressure piston 39 and for the connection of the platen 15 upwards with the driving parts. To the pressure cylinder 40.is attached a pressure age 38 which indicates the pressure existmg within the cylinder 40, and is consequently that whereby the adjusted. In certain cases where during the work circuitof the piston 39, pressure water is forced forward from the c linder 40 through the valve 30 into the cylinder 31, it is advantageous to effect the pressln back of the pressure water through the 'va ve 36 in the cylinder 40 by means of a spring 47 which latter rests against a cross-piece 49 supported by the plllars 48 as shown 1n Fi 5.

i laving thus fully described my invention, what I claim is safety valve 30 is.

1. In a power press, the combination, with piston carried .by the driving member, a

drive cylinder to receive the piston, a p essure cylinder communicating with the first cylinder, a pressure piston in the second cylinder, and a connection between the pressure piston and stamp, said transmission means comprising provision to enable the degree of power applied to be altered as desired.

3. In a power press, the combination with the Work holder, the stamp, and the driving member, of a platen carrying the stamp, a drive cylinder in said platen, a drive piston carried by the drive member and moving in the cylinder, a plurality of pressure cylinders in the platen communicating with the drive cylinder, pressure'pistons in the pressurecylinders, links suspending the pressure pistons from a fixed support and arranged when in a vertical position to act as upper abutments for the said pistons.

4. In a power press, the combination with the work holder, thestamp, and the driving member, of a platen carrying the stamp, a drive cylinder in said platen, a drive piston carried by the drive member and moving-in the cylinder, a plurality of pressure cylinders in the platen communicating with the drive'cylinder, pressure pistons in the pressure cylinders, links suspending the pressure pistons from a fixed support and arranged when in a vertical position to act as upper abutments for the said pistons, and means controlled by the ascending platen and acting upon the links to swing the same to one side to permit the pressure pistons to rise.

5. In a power press, the combination with the work-holder, the stamp, and the driving member, of a platen carrying the stamp, a drive cylinder in said platen, a drive piston carried by the drive member and moving in 40 pistons from a fixed support and arranged when in a vertical position to act as upper abutments for'the said pistons, and a safety valve arranged as an emergency outlet from the drive cylinders.

6. In a power press, the combination with 5 the work holder, the stamp, and the driving member, of a platen carrying the stamp, a drive cylinder in said-platen, a drive piston carried by the drive member and moving in v the cylinder, a plurality of pressure cylinders in the platen communicating with the drive cylinder, pressure pistons in the pressure cylinders, links suspending the pressure pistons from a fixed support and arranged when in a vertical position to act as upper abutments for the said pistons, a supplemental reservoir formed asa cylinder, a piston moving therein, a safety valve arranged in an emergency outlet from the drivecylin ders to the supplemental reservoir, a return 5 passage from the reservoir to the pressure cylinder, a two-arm lever suitably fulcrumed with one arm in the path of the ascending pressure piston and the other arm bearing,

upon the reservoir piston whereby the water escaping through -the safety valve is again returned to the pressure cylinder.

In testimony whereof I hereuntoaflix my signature in the presence of two witnesses.

NORBERT SPERBER. Witnesses:

ARTHUR LEON, ERNEST MILES. 

